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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.types.resources.selectors;
import java.util.Stack;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.Comparison;
import org.apache.tools.ant.types.DataType;
import org.apache.tools.ant.types.Quantifier;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.Union;
import org.apache.tools.ant.types.resources.comparators.DelegatedResourceComparator;
import org.apache.tools.ant.types.resources.comparators.ResourceComparator;
/**
* ResourceSelector that compares against "control" Resource(s)
* using ResourceComparators.
* @since Ant 1.7
*/
public class Compare extends DataType implements ResourceSelector {
private static final String ONE_CONTROL_MESSAGE
= " the <control> element should be specified exactly once.";
private DelegatedResourceComparator comp = new DelegatedResourceComparator();
private Quantifier against = Quantifier.ALL;
private Comparison when = Comparison.EQUAL;
private Union control;
/**
* Add a ResourceComparator to this Compare selector.
* If multiple ResourceComparators are added, they will be processed in LIFO order.
* @param c the ResourceComparator to add.
*/
public synchronized void add(ResourceComparator c) {
if (isReference()) {
throw noChildrenAllowed();
}
comp.add(c);
setChecked(false);
}
/**
* Set the quantifier to be used. Default "all".
* @param against the Quantifier EnumeratedAttribute to use.
*/
public synchronized void setAgainst(Quantifier against) {
if (isReference()) {
throw tooManyAttributes();
}
this.against = against;
}
/**
* Set the comparison to be used. Default "equal".
* @param when the Comparison EnumeratedAttribute to use.
*/
public synchronized void setWhen(Comparison when) {
if (isReference()) {
throw tooManyAttributes();
}
this.when = when;
}
/**
* Create the nested control element. These are the
* resources to compare against.
* @return ResourceCollection.
*/
public synchronized ResourceCollection createControl() {
if (isReference()) {
throw noChildrenAllowed();
}
if (control != null) {
throw oneControl();
}
control = new Union();
setChecked(false);
return control;
}
//implement ResourceSelector; inherit doc
/** {@inheritDoc} */
public synchronized boolean isSelected(Resource r) {
if (isReference()) {
return ((ResourceSelector) getCheckedRef()).isSelected(r);
}
if (control == null) {
throw oneControl();
}
dieOnCircularReference();
int t = 0, f = 0;
for (Resource res : control) {
if (when.evaluate(comp.compare(r, res))) {
t++;
} else {
f++;
}
}
return against.evaluate(t, f);
}
/**
* Overrides the version from DataType
* to recurse on nested ResourceComparators.
* @param stk the stack of data types to use (recursively).
* @param p the project to use to dereference the references.
* @throws BuildException on error.
*/
protected synchronized void dieOnCircularReference(Stack<Object> stk, Project p)
throws BuildException {
if (isChecked()) {
return;
}
if (isReference()) {
super.dieOnCircularReference(stk, p);
} else {
if (control != null) {
DataType.pushAndInvokeCircularReferenceCheck(control, stk, p);
}
DataType.pushAndInvokeCircularReferenceCheck(comp, stk, p);
setChecked(true);
}
}
private BuildException oneControl() {
return new BuildException(super.toString() + ONE_CONTROL_MESSAGE);
}
}
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